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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
The template utilizes the lift plugin to leverage AWS CDK and expand Serverless' functions to avoid all the yak-shaving at the beginning. One can always tweak the parameters afterward, be it from the serverless.yml configuration file or directly from the AWS console.
Our backend is in node.js and we deploy in the AWS ecosystem. As part of our user flow, we use email both for notifications as a response to a user action (transactional) and some custom marketing automation. Sendgrid is our service of choice for those matters.